Well, something similar to Tyranny of steel or laws of devil.. basically mc is reincarnated into a noble family and then he developes his territory with wars and stuff along the way... Don't recommend something like Desolate Era.. i don't want the main plot to be cultivation... The main plot should be politics or kingdom building also it's fine if there's herem too...
I don't know if you have read these two novels... The Greatest Estate Designer (Manhwa/Novel) Release that Witch Extra Recommendation: This Game Is Too Realistic (Similar but not noble and it's sci-fi)
Tales of the Reincarnated Lord Black Iron’s Glory Game of the monarch I'm the Evil Lord of an Intergalactic Empire! I am the Monarch Amber Sword